docs: def jacobian(self):
          """
          :return: Jacobian filled with the symbolic expressions for all the
              partial derivatives. Partial derivatives are of the components of
              the function with respect to the Parameter's, not the independent
              Variable's. The return shape is a list over the models components,
              filled with tha symbolical jacobian for that component, as a list.
          """
          jac = []
          for var, expr in self.items():
              jac_row = []
              for param in self.params:
                  partial_dv = D(var, param)
                  jac_row.append(self.jacobian_model[partial_dv])
              jac.append(jac_row)
          return jac